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Thiamine (Vitamin B1) - Feed Ingredient

Thiamine, also known as Vitamin B1, is a water-soluble vitamin essential for carbohydrate metabolism, nervous system function, and energy production in horses. It plays a critical role in the conversion of glucose into ATP, the primary energy source for cells, by acting as a coenzyme in the Krebs cycle. Thiamine is also necessary for the proper functioning of the nervous system, as it helps regulate neurotransmitter activity and nerve impulse transmission.

Horses naturally produce some thiamine through microbial fermentation in the hindgut, and additional dietary sources include cereal grains, wheat bran, and brewer’s yeast. Deficiency is rare but can occur due to prolonged antibiotic use, excessive grain consumption, or ingestion of plants containing thiaminase enzymes (such as bracken fern and horsetail), which degrade thiamine. Symptoms of deficiency may include weight loss, muscle tremors, incoordination, and nervous system disturbances. In such cases, thiamine supplementation in the form of thiamine hydrochloride or thiamine mononitrate may be beneficial. As a water-soluble vitamin, excess thiamine is excreted in urine, making toxicity unlikely, though balanced supplementation is advised for optimal health.

The following equine feeds, supplements and products contain Thiamine (Vitamin B1) as an ingredient.

Feeds, Supplements & Products
AminoTrace+ Vitamin and Mineral Supplement (Mad Barn)
Hoof HealthHoof Health
Metabolic SyndromeMetabolic Syndrome
Organic Trace MineralsOrganic Trace Minerals
VitaminsVitamins
AminoTrace+ by Mad Barn is a complete, balanced equine mineral and vitamin supplement designed for horses with metabolic concerns. It is ideal for horses with IR, PPID, or high iron in the diet.
B-Vitamin Pak (Mad Barn)
CalmingCalming
ExerciseExercise
StressStress
VitaminsVitamins
B-Vitamin Pak is a comprehensive B-vitamin supplement in powder form. It provides a balanced profile of the B-Complex vitamins and may be beneficial for horses during times of heavy work, stress, or illness.
Omneity P – Pellets – Vitamin & Mineral Supplement (Mad Barn)
Gut HealthGut Health
Hoof HealthHoof Health
Mineral BalanceMineral Balance
Organic Trace MineralsOrganic Trace Minerals
Ration BalancerRation Balancer
Omneity Pellets is a balanced mineral and vitamin supplement for horses in a palatable pellet form. It provides 100% organic trace minerals, complete B-vitamin fortification, added Vitamin E, yeast and digestive enzymes.
Omneity Premix – Vitamin & Mineral Supplement (Mad Barn)
Hoof HealthHoof Health
Mineral BalanceMineral Balance
Organic Trace MineralsOrganic Trace Minerals
VitaminsVitamins
Omneity Premix is a balanced mineral and vitamin supplement for horses providing 100% organic trace minerals, complete B-vitamin fortification, added Vitamin E, yeast, and digestive enzymes.
Enrich Plus Ration Balancing Concentrate (Purina)
Easy KeeperEasy Keeper
NutritionNutrition
Ration BalancerRation Balancer
VitaminsVitamins
Purina Enrich Plus Ration Balancing is a concentrated, pelleted formula intended for easy keepers, growing horses, breeding stallions, and early gestation mares. It contains 32% crude protein and 15% NSC.
Enrich Plus Senior (Purina)
Complete FeedComplete Feed
DentalDental
FiberFiber
SeniorSenior
Enrich Plus Senior Ration Balancing Horse Feed by Purina is a complete pelleted feed intended for senior horses. It is to be fed in addition to forage.
Enrichment (Excel Equine)
DigestionDigestion
HealthHealth
Metabolic SyndromeMetabolic Syndrome
SeniorSenior
Enrichment by Excel Equine is a specially formulated pelleted feed designed for senior horses with chronic health conditions. It contains 26% protein, 6% fiber, and 3% fat to support their unique nutritional needs.
Eq-Well (Arenus Animal Health)
HealthHealth
Mineral BalanceMineral Balance
NutrientsNutrients
NutritionNutrition
Eq-Well by Arenus Animal Health is an equine vitamin and mineral balancer. It is a granular supplement intended for horses of all ages and work levels.
EQ8 Gut Health (Buckeye)
DigestionDigestion
Gut HealthGut Health
PrebioticPrebiotic
ProbioticProbiotic
EQ8 Gut Health is a textured feed intended for horses in maintenance to moderate exercise. This feed provides 20% NSC and contains calcium, prebiotics, probiotics and yeast to support digestive health.
EQ8 Performance Gut Health (Buckeye)
DigestionDigestion
Gut HealthGut Health
PrebioticPrebiotic
ProbioticProbiotic
EQ8 Performance Gut Health is a calorie-dense extruded feed for active horses. This feed contains 20% NSC, 14% protein and 12% fat. It provides calcium, probiotics and yeast to support digestive health.
EQ8 Senior Gut Health (Buckeye)
DigestionDigestion
Gut HealthGut Health
PrebioticPrebiotic
ProbioticProbiotic
EQ8 Senior Gut Health is a multi-textured feed formulated for geriatric horses. It provides 14% protein, 10% fat and 20% NSC. It contains calcium, prebiotics, probiotics and yeast to support digestive health.
Eqceed 14 (Tucker Milling)
Complete FeedComplete Feed
FiberFiber
HealthHealth
NutritionNutrition
Eqceed 14 by Tucker Milling is a pelleted complete feed that contains 8% fat. It is formulated for working and maintenance horses and is marketed as a low starch feed.
Eqceed Ultra Senior (Tucker Milling)
Complete FeedComplete Feed
Gut HealthGut Health
Metabolic SyndromeMetabolic Syndrome
SeniorSenior
Eqceed Ultra Senior by Tucker Milling is a textured, high-fat, low-starch feed formulated specifically for senior horses. It includes shredded beet pulp and Lactobacillus, which supports gut health, and it can served as a complete replacement for hay or pasture.
Equalizer (Seminole)
Amino AcidAmino Acid
Competition HorsesCompetition Horses
Mineral BalanceMineral Balance
VitaminsVitamins
Seminole Equalizer is a high-protein pelleted ration balancer. It contains supplemental amino acids, a blend of organic and inorganic minerals, and added vitamins.
Equerry’s Choice (Equerry’s Horse)
DigestionDigestion
Mineral BalanceMineral Balance
ProbioticProbiotic
VitaminsVitamins
Equerry's Choice is a micro-encapsulated blend of probiotics and digestive enzymes. It also contains minerals and vitamins including organic selenium. This supplement is recommended for all horses and ponies at any work level.
Equerry’s Plus
DigestionDigestion
Mineral BalanceMineral Balance
VitaminsVitamins
YeastYeast
Equerry's Plus is a horse supplement that provides microencapsulated probiotics and digestive enzymes. This product contains live yeast culture, chelated minerals, and vitamins. Equerry's Plus is intended for all horses and ponies.
Equi-Base Grass Pellets (Uckele)
HealthHealth
MetabolismMetabolism
NutrientsNutrients
Ration BalancerRation Balancer
Equi-Base Grass Pellet is a base mineral and vitamin supplement designed to balance diets based on grass hay/forage or a 50/50 alfalfa grass forage.
Equi-Base Senior (Uckele)
HealthHealth
Mineral BalanceMineral Balance
SeniorSenior
VitaminsVitamins
Equi-Base Senior is a powdered vitamin, mineral and amino acid supplement formulated for senior horses. It contains ingredients which can support hoof, coat, immune and digestive function.
Equi-Bone Pellets (TLC Animal Nutrition)
Bone HealthBone Health
JointsJoints
NutrientsNutrients
RecoveryRecovery
Equi-Bone by TLC Animal Nutrition is a pelleted supplement intended to support bone health in all horse types.
Equi-Bone Powder (TLC Animal Nutrition)
Bone HealthBone Health
JointsJoints
NutrientsNutrients
RecoveryRecovery
Equi-Bone Powder by TLC Animal Nutrition is a powdered supplement intended to support bone health in all horse types.
Equi-Cell (Select The Best)
Blood CellsBlood Cells
Mineral BalanceMineral Balance
NutrientsNutrients
VitaminsVitamins
Equi-Cell by Select The Best is a liquid supplement that contains iron, copper, B–vitamins, antioxidants, and selenium. It is intended for performance horses to support energy and metabolism.
Equi-Eez (Purina)
HealthHealth
Metabolic SyndromeMetabolic Syndrome
Mineral BalanceMineral Balance
VitaminsVitamins
Equi-Eez is a concentrated mineral and vitamin supplement that does not contain fibre, fat or protein. It is fortified with biotin to support hoof health and coat quality.
Equi-Ferm XL (Tribute)
DigestionDigestion
FatFat
Gut HealthGut Health
ProbioticProbiotic
Tribute Equi-Ferm XL is a pelleted horse supplement containing live Saccharomyces cerevisiae yeast cultures, intended to improve the digestibility of feeds.
Equi-Min Bits (Practical Equine Supplements)
FlavorFlavor
Organic Trace MineralsOrganic Trace Minerals
VitaminsVitamins
YeastYeast
Equi-Min Bits from Practical Equine Supplements is a vitamin and mineral pelleted supplement. It contains yeast cultures, organic trace minerals and is apple flavored.
EQUI-PRO East Coast Race (Poulin Grain)
GrainsGrains
Mineral BalanceMineral Balance
PerformancePerformance
VitaminsVitamins
EQUI-PRO East Coast Race by Poulin Grain is a textured feed intended for race horses. This feed provides high energy density from oats, beet pulp, corn, and molasses. It contains 13% protein, 8% fat, and 12% fiber.
EQUI-PRO Mare & Foal (Poulin Grain)
FoalFoal
GrowthGrowth
LactationLactation
MareMare
EQUI-PRO Mare & Foal by Poulin Grain is a textured feed intended for broodmares and growing horses. It provides 15% protein, 6% fat, and 10% fiber.
EQUI-PRO Performance Senior (Poulin Grain)
DigestionDigestion
PerformancePerformance
SeniorSenior
Weight IssuesWeight Issues
EQUI-PRO Senior Performance by Poulin Grain is a pelleted feed intended to provide digestive support and promote healthy weight in active senior horses.
EQUI-PRO PerforMAX (Poulin Grain)
Caloric EnergyCaloric Energy
GrainsGrains
VitaminsVitamins
Weight IssuesWeight Issues
EQUI-PRO PerforMAX by Poulin Grain is a textured feed intended for performance horses requiring high energy density. It contains 12% protein, 12% fat and 12% fiber.
EQUI-PRO Premium Senior (Poulin Grain)
Mineral BalanceMineral Balance
SeniorSenior
VitaminsVitamins
Weight IssuesWeight Issues
EQUI-PRO Premium Senior by Poulin Grain is a pelleted feed intended for senior horses with digestive issues. It provides 14% protein, 6% fat, and 18% fiber.
EQUI-PRO ProMax (Poulin Grain)
Mineral BalanceMineral Balance
PerformancePerformance
VitaminsVitamins
Weight IssuesWeight Issues
EQUI-PRO ProMax by Poulin Grain is a pelleted feed formulated for performance horses and hard-keepers. It provides a higher energy density and contains 12% protein, 12% fat and 12% fiber.
Equi-Sentials (Agri Dynamics)
Amino AcidAmino Acid
Mineral BalanceMineral Balance
NutritionNutrition
VitaminsVitamins
Equi-Sentials by Agri Dynamics is a premixed supplement that is meant to provide macro and micronutrients from kelp and prehistoric ocean deposits. It contains amino acid complexes, fat and water-soluble vitamin, and probiotics.
Equi-Shine (Doctors Choice Supplements)
Mineral BalanceMineral Balance
NutritionNutrition
Ration BalancerRation Balancer
VitaminsVitamins
Equi-Shine Pellet is a ration balancer that covers nutrient gaps in the equine diet and supports coat and hoof quality. It provides vitamins, amino acids, and a blend of organic and inorganic trace minerals.
Equi-Star (Hubbard Feeds)
Mineral BalanceMineral Balance
NutrientsNutrients
ProteinProtein
VitaminsVitamins
Equi-Star from Hubbard is a complete feed for pleasure horses at maintenance. It supplies 12% protein and 3% fat, as well as vitamins and minerals.
Equi-VM (Uckele)
HealthHealth
NutrientsNutrients
ProbioticProbiotic
Ration BalancerRation Balancer
Equi-VM is a powdered vitamin and trace mineral supplement from Uckele Health & Nutrition. It also contains probiotics and digestive enzymes.
Equi22 (Purina)
HealthHealth
Hoof HealthHoof Health
NutrientsNutrients
Ration BalancerRation Balancer
Purina Equi22 is a concentrated vitamin and mineral supplement in a pelleted format. It is designed to meet the needs of a wide range of horses.
EquiBalance (Sollio Agriculture)
Amino AcidAmino Acid
HealthHealth
Low NSC FeedsLow NSC Feeds
VitaminsVitamins
EquiBalance is a concentrated pelleted vitamin, mineral and amino acid supplement for horses. EquiBalance is intended for horses who are receiving a complete feed. This supplement is intended for horses with metabolic disorders.
Equibility (Hallway)
Complete FeedComplete Feed
ExerciseExercise
FatFat
FiberFiber
Equibility from Hallway is a pelleted feed fortified with Stamm 30 formulated for active adult horses. This feed uses energy from digestible fibres and vegetable oil, providing 12% protein, 8% fat, and 15% fibre.
Equicell-R – Liquid Flavoured Vitamin-Mineral Supplement
DentalDental
HealthHealth
Ration BalancerRation Balancer
VitaminsVitamins
Pharm-Vet Equicell-R is a liquid mineral and vitamin supplement for horses. It contains added iron and is designed to provide nutrients that may be lacking in the equine diet.
Equidyne (Lakin Milling Company)
EnergyEnergy
GrainsGrains
NutrientsNutrients
NutritionNutrition
Equidyne from Lakin Milling Company is a pelleted horse feed formulated with alfalfa, corn, and added minerals. Equidyne Fortified Horse Pellets are intended for horses in moderate to heavy work.
Equiette (Dynavyte)
CalmingCalming
HerbHerb
PerformancePerformance
StressStress
Equiette by Dynavyte is an herbal supplement intended to reduce anxiety in horses during shoeing, training, floating, travel, etc.
Equilene Complete (Bluebonnet Feeds)
BroodmareBroodmare
Complete FeedComplete Feed
Gut HealthGut Health
PerformancePerformance
Equilene Complete from Bluebonnet is a feed that is meant to be used as a forage replacer, designed for horses at all life stages. This feed provides 10% starch, and 4% sugar.
Equilene Pelleted (Bluebonnet Feeds)
Gut HealthGut Health
Mineral BalanceMineral Balance
ProteinProtein
VitaminsVitamins
Equilene Pelleted from Bluebonnet is a feed intended for horses at all life stages, including breeding, and performance horses. This feed contains 11% starch, 5% sugars, and uses a mix of organic and inorganic trace minerals.
Equilene Pro Care (Bluebonnet Feeds)
FiberFiber
Gut HealthGut Health
Mineral BalanceMineral Balance
VitaminsVitamins
Equilene Pro Care from Bluebonnet Feeds is a beet pulp-based complete feed formulated to support digestive health. It is a low starch formula with 5.5% starch and 8% sugar. It contains added calcium, butyric acid and zinc for digestive support.
Equilene Textured (Bluebonnet Feeds)
Caloric EnergyCaloric Energy
GrainsGrains
Mineral BalanceMineral Balance
VitaminsVitamins
Equilene Textured feed from Bluebonnet Feeds is a complete feed for growth, performance, breeding and horses at maintenance. It contains molasses and vegetable oil as added sources of energy.
Equilene Track Master Ultra Fat (Bluebonnet Feeds)
Caloric EnergyCaloric Energy
Mineral BalanceMineral Balance
PerformancePerformance
VitaminsVitamins
Equilene Track Master Ultra Fat from Bluebonnet Feeds is a high-energy textured feed intended for performance horses. This high-NSC feed contains 30% starch, and 11% sugars,
Equilibrium Equilizer (Purina Canada)
HealthHealth
Low NSC FeedsLow NSC Feeds
Ration BalancerRation Balancer
VitaminsVitamins
Equilibrium Equilizer is a ration balancer that can be fed with other complete feeds or concentrates for horses in moderate to heavy work. This nutrient-dense ration balancer contains elevated levels of vitamins and minerals. It is suitable for a low NSC diet.
Equilibrium Legend XT (Purina)
BroodmareBroodmare
FatFat
FiberFiber
PerformancePerformance
Equilibrium Legend XT is a high caloric extruded feed made for performance athletes and broodmares. It contains 10% fat and 10% fiber.
Equilibrium Maternity XT (Purina)
BroodmareBroodmare
Complete FeedComplete Feed
GrowthGrowth
LactationLactation
Equilibrium Maternity XT is an extruded feed formulated for gestating mares as well as nursing and growing foals. It provides high energy and protein (16.5%) from ingredients such as soybean meal, flax, wheat, soybean oil and molasses.
Equilibrium Optimal (Purina)
BroodmareBroodmare
NutrientsNutrients
Ration BalancerRation Balancer
VitaminsVitamins
Equilibrium Optimal is a ration balancer formulated for all classes of horses. It can be fed alone or in combination with complete feeds or other feed ingredients such as beet pulp.
Equilibrium Pro Plus (Purina)
Caloric EnergyCaloric Energy
Complete FeedComplete Feed
FatFat
PerformancePerformance
Equilibrium Pro Plus by Purina is intended for performance horses, stallions, broodmares and growing foals. It contains 14% protein and 7% fat from sources such as soy hulls, soybean meal, ground corn, and ground wheat.
Equilibrium Sport XT (Purina) – [Discontinued]
Caloric EnergyCaloric Energy
ExerciseExercise
GrowthGrowth
PerformancePerformance
Equilibrium Sport XT is an extruded feed formulated for performance, breeding and growing horses. It provides high fat (10%) and moderate protein (14%) from ingredients including soybean meal, flax, wheat, soybean oil and molasses.
Equilibrium Trimax (Purina)
Caloric EnergyCaloric Energy
Complete FeedComplete Feed
PerformancePerformance
Weight IssuesWeight Issues
Purina Equilibrium Trimax is an energy-dense multi-particle feed intended for hard-keepers and performance horses. It provides 12% fat from vegetable oils and fermentable fibre from beet pulp to meet higher calorie requirements.
Equilibrium® XCEL HD (Purina Canada)
Competition HorsesCompetition Horses
FatFat
HindgutHindgut
Weight IssuesWeight Issues
Equilibrium® XCEL HD is a high-fat feed from the Purina Platinum product line. This low glycemic feed contains higher fat and fibre content and is intended for equine athletes and hard keepers.
Equiline Pelleted All-In-One Ration (Shur-Gain)
Complete FeedComplete Feed
HealthHealth
NutrientsNutrients
NutritionNutrition
Equiline Pelleted All-In-One Ration from Shur-Gain is a pelleted complete feed intended for horses in light to moderate work. This feed is forage based, with a balanced nutrient composition.

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